net/ieee802154/6lowpan_rtnl.c

   1 /* Copyright 2011, Siemens AG
   2  * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
   3  */
   4
   5 /* Based on patches from Jon Smirl <jonsmirl@gmail.com>
   6  * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 /* Jon's code is based on 6lowpan implementation for Contiki which is:
  19  * Copyright (c) 2008, Swedish Institute of Computer Science.
  20  * All rights reserved.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. Neither the name of the Institute nor the names of its contributors
  31  *    may be used to endorse or promote products derived from this software
  32  *    without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  35  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  36  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  37  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  38  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  39  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  40  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  41  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  42  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  43  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  44  * SUCH DAMAGE.
  45  */
  46
  47 #include <linux/bitops.h>
  48 #include <linux/if_arp.h>
  49 #include <linux/module.h>
  50 #include <linux/moduleparam.h>
  51 #include <linux/netdevice.h>
  52 #include <net/af_ieee802154.h>
  53 #include <net/ieee802154.h>
  54 #include <net/ieee802154_netdev.h>
  55 #include <net/6lowpan.h>
  56 #include <net/ipv6.h>
  57
  58 #include "reassembly.h"
  59
  60 static LIST_HEAD(lowpan_devices);
  61
  62 /* private device info */
  63 struct lowpan_dev_info {
  64         struct net_device       *real_dev; /* real WPAN device ptr */
  65         struct mutex            dev_list_mtx; /* mutex for list ops */
  66         __be16                  fragment_tag;
  67 };
  68
  69 struct lowpan_dev_record {
  70         struct net_device *ldev;
  71         struct list_head list;
  72 };
  73
  74 static inline struct
  75 lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
  76 {
  77         return netdev_priv(dev);
  78 }
  79
  80 static inline void lowpan_address_flip(u8 *src, u8 *dest)
  81 {
  82         int i;
  83         for (i = 0; i < IEEE802154_ADDR_LEN; i++)
  84                 (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
  85 }
  86
  87 static int lowpan_header_create(struct sk_buff *skb,
  88                            struct net_device *dev,
  89                            unsigned short type, const void *_daddr,
  90                            const void *_saddr, unsigned int len)
  91 {
  92         const u8 *saddr = _saddr;
  93         const u8 *daddr = _daddr;
  94         struct ieee802154_addr sa, da;
  95         struct ieee802154_mac_cb *cb = mac_cb_init(skb);
  96
  97         /* TODO:
  98          * if this package isn't ipv6 one, where should it be routed?
  99          */
 100         if (type != ETH_P_IPV6)
 101                 return 0;
 102
 103         if (!saddr)
 104                 saddr = dev->dev_addr;
 105
 106         raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
 107         raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
 108
 109         lowpan_header_compress(skb, dev, type, daddr, saddr, len);
 110
 111         /* NOTE1: I'm still unsure about the fact that compression and WPAN
 112          * header are created here and not later in the xmit. So wait for
 113          * an opinion of net maintainers.
 114          */
 115         /* NOTE2: to be absolutely correct, we must derive PANid information
 116          * from MAC subif of the 'dev' and 'real_dev' network devices, but
 117          * this isn't implemented in mainline yet, so currently we assign 0xff
 118          */
 119         cb->type = IEEE802154_FC_TYPE_DATA;
 120
 121         /* prepare wpan address data */
 122         sa.mode = IEEE802154_ADDR_LONG;
 123         sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
 124         sa.extended_addr = ieee802154_devaddr_from_raw(saddr);
 125
 126         /* intra-PAN communications */
 127         da.pan_id = sa.pan_id;
 128
 129         /* if the destination address is the broadcast address, use the
 130          * corresponding short address
 131          */
 132         if (lowpan_is_addr_broadcast(daddr)) {
 133                 da.mode = IEEE802154_ADDR_SHORT;
 134                 da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 135         } else {
 136                 da.mode = IEEE802154_ADDR_LONG;
 137                 da.extended_addr = ieee802154_devaddr_from_raw(daddr);
 138         }
 139
 140         cb->ackreq = !lowpan_is_addr_broadcast(daddr);
 141
 142         return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
 143                         type, (void *)&da, (void *)&sa, 0);
 144 }
 145
 146 static int lowpan_give_skb_to_devices(struct sk_buff *skb,
 147                                         struct net_device *dev)
 148 {
 149         struct lowpan_dev_record *entry;
 150         struct sk_buff *skb_cp;
 151         int stat = NET_RX_SUCCESS;
 152
 153         rcu_read_lock();
 154         list_for_each_entry_rcu(entry, &lowpan_devices, list)
 155                 if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
 156                         skb_cp = skb_copy(skb, GFP_ATOMIC);
 157                         if (!skb_cp) {
 158                                 stat = -ENOMEM;
 159                                 break;
 160                         }
 161
 162                         skb_cp->dev = entry->ldev;
 163                         stat = netif_rx(skb_cp);
 164                 }
 165         rcu_read_unlock();
 166
 167         return stat;
 168 }
 169
 170 static int process_data(struct sk_buff *skb, const struct ieee802154_hdr *hdr)
 171 {
 172         u8 iphc0, iphc1;
 173         struct ieee802154_addr_sa sa, da;
 174         void *sap, *dap;
 175
 176         raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len);
 177         /* at least two bytes will be used for the encoding */
 178         if (skb->len < 2)
 179                 goto drop;
 180
 181         if (lowpan_fetch_skb_u8(skb, &iphc0))
 182                 goto drop;
 183
 184         if (lowpan_fetch_skb_u8(skb, &iphc1))
 185                 goto drop;
 186
 187         ieee802154_addr_to_sa(&sa, &hdr->source);
 188         ieee802154_addr_to_sa(&da, &hdr->dest);
 189
 190         if (sa.addr_type == IEEE802154_ADDR_SHORT)
 191                 sap = &sa.short_addr;
 192         else
 193                 sap = &sa.hwaddr;
 194
 195         if (da.addr_type == IEEE802154_ADDR_SHORT)
 196                 dap = &da.short_addr;
 197         else
 198                 dap = &da.hwaddr;
 199
 200         return lowpan_process_data(skb, skb->dev, sap, sa.addr_type,
 201                                    IEEE802154_ADDR_LEN, dap, da.addr_type,
 202                                    IEEE802154_ADDR_LEN, iphc0, iphc1,
 203                                    lowpan_give_skb_to_devices);
 204
 205 drop:
 206         kfree_skb(skb);
 207         return -EINVAL;
 208 }
 209
 210 static int lowpan_set_address(struct net_device *dev, void *p)
 211 {
 212         struct sockaddr *sa = p;
 213
 214         if (netif_running(dev))
 215                 return -EBUSY;
 216
 217         /* TODO: validate addr */
 218         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 219
 220         return 0;
 221 }
 222
 223 static struct sk_buff*
 224 lowpan_alloc_frag(struct sk_buff *skb, int size,
 225                   const struct ieee802154_hdr *master_hdr)
 226 {
 227         struct net_device *real_dev = lowpan_dev_info(skb->dev)->real_dev;
 228         struct sk_buff *frag;
 229         int rc;
 230
 231         frag = alloc_skb(real_dev->hard_header_len +
 232                          real_dev->needed_tailroom + size,
 233                          GFP_ATOMIC);
 234
 235         if (likely(frag)) {
 236                 frag->dev = real_dev;
 237                 frag->priority = skb->priority;
 238                 skb_reserve(frag, real_dev->hard_header_len);
 239                 skb_reset_network_header(frag);
 240                 *mac_cb(frag) = *mac_cb(skb);
 241
 242                 rc = dev_hard_header(frag, real_dev, 0, &master_hdr->dest,
 243                                      &master_hdr->source, size);
 244                 if (rc < 0) {
 245                         kfree_skb(frag);
 246                         return ERR_PTR(-rc);
 247                 }
 248         } else {
 249                 frag = ERR_PTR(ENOMEM);
 250         }
 251
 252         return frag;
 253 }
 254
 255 static int
 256 lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr,
 257                      u8 *frag_hdr, int frag_hdrlen,
 258                      int offset, int len)
 259 {
 260         struct sk_buff *frag;
 261
 262         raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen);
 263
 264         frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr);
 265         if (IS_ERR(frag))
 266                 return -PTR_ERR(frag);
 267
 268         memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen);
 269         memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len);
 270
 271         raw_dump_table(__func__, " fragment dump", frag->data, frag->len);
 272
 273         return dev_queue_xmit(frag);
 274 }
 275
 276 static int
 277 lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev,
 278                        const struct ieee802154_hdr *wpan_hdr)
 279 {
 280         u16 dgram_size, dgram_offset;
 281         __be16 frag_tag;
 282         u8 frag_hdr[5];
 283         int frag_cap, frag_len, payload_cap, rc;
 284         int skb_unprocessed, skb_offset;
 285
 286         dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
 287                      skb->mac_len;
 288         frag_tag = lowpan_dev_info(dev)->fragment_tag++;
 289
 290         frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07);
 291         frag_hdr[1] = dgram_size & 0xff;
 292         memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag));
 293
 294         payload_cap = ieee802154_max_payload(wpan_hdr);
 295
 296         frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE -
 297                               skb_network_header_len(skb), 8);
 298
 299         skb_offset = skb_network_header_len(skb);
 300         skb_unprocessed = skb->len - skb->mac_len - skb_offset;
 301
 302         rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
 303                                   LOWPAN_FRAG1_HEAD_SIZE, 0,
 304                                   frag_len + skb_network_header_len(skb));
 305         if (rc) {
 306                 pr_debug("%s unable to send FRAG1 packet (tag: %d)",
 307                          __func__, frag_tag);
 308                 goto err;
 309         }
 310
 311         frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1;
 312         frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN;
 313         frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8);
 314
 315         do {
 316                 dgram_offset += frag_len;
 317                 skb_offset += frag_len;
 318                 skb_unprocessed -= frag_len;
 319                 frag_len = min(frag_cap, skb_unprocessed);
 320
 321                 frag_hdr[4] = dgram_offset >> 3;
 322
 323                 rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
 324                                           LOWPAN_FRAGN_HEAD_SIZE, skb_offset,
 325                                           frag_len);
 326                 if (rc) {
 327                         pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
 328                                  __func__, frag_tag, skb_offset);
 329                         goto err;
 330                 }
 331         } while (skb_unprocessed > frag_cap);
 332
 333         consume_skb(skb);
 334         return NET_XMIT_SUCCESS;
 335
 336 err:
 337         kfree_skb(skb);
 338         return rc;
 339 }
 340
 341 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
 342 {
 343         struct ieee802154_hdr wpan_hdr;
 344         int max_single;
 345
 346         pr_debug("package xmit\n");
 347
 348         if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) {
 349                 kfree_skb(skb);
 350                 return NET_XMIT_DROP;
 351         }
 352
 353         max_single = ieee802154_max_payload(&wpan_hdr);
 354
 355         if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) {
 356                 skb->dev = lowpan_dev_info(dev)->real_dev;
 357                 return dev_queue_xmit(skb);
 358         } else {
 359                 netdev_tx_t rc;
 360
 361                 pr_debug("frame is too big, fragmentation is needed\n");
 362                 rc = lowpan_xmit_fragmented(skb, dev, &wpan_hdr);
 363
 364                 return rc < 0 ? NET_XMIT_DROP : rc;
 365         }
 366 }
 367
 368 static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
 369 {
 370         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 371         return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
 372 }
 373
 374 static __le16 lowpan_get_pan_id(const struct net_device *dev)
 375 {
 376         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 377         return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
 378 }
 379
 380 static __le16 lowpan_get_short_addr(const struct net_device *dev)
 381 {
 382         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 383         return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
 384 }
 385
 386 static u8 lowpan_get_dsn(const struct net_device *dev)
 387 {
 388         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 389         return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
 390 }
 391
 392 static struct header_ops lowpan_header_ops = {
 393         .create = lowpan_header_create,
 394 };
 395
 396 static struct lock_class_key lowpan_tx_busylock;
 397 static struct lock_class_key lowpan_netdev_xmit_lock_key;
 398
 399 static void lowpan_set_lockdep_class_one(struct net_device *dev,
 400                                          struct netdev_queue *txq,
 401                                          void *_unused)
 402 {
 403         lockdep_set_class(&txq->_xmit_lock,
 404                           &lowpan_netdev_xmit_lock_key);
 405 }
 406
 407
 408 static int lowpan_dev_init(struct net_device *dev)
 409 {
 410         netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
 411         dev->qdisc_tx_busylock = &lowpan_tx_busylock;
 412         return 0;
 413 }
 414
 415 static const struct net_device_ops lowpan_netdev_ops = {
 416         .ndo_init               = lowpan_dev_init,
 417         .ndo_start_xmit         = lowpan_xmit,
 418         .ndo_set_mac_address    = lowpan_set_address,
 419 };
 420
 421 static struct ieee802154_mlme_ops lowpan_mlme = {
 422         .get_pan_id = lowpan_get_pan_id,
 423         .get_phy = lowpan_get_phy,
 424         .get_short_addr = lowpan_get_short_addr,
 425         .get_dsn = lowpan_get_dsn,
 426 };
 427
 428 static void lowpan_setup(struct net_device *dev)
 429 {
 430         dev->addr_len           = IEEE802154_ADDR_LEN;
 431         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 432         dev->type               = ARPHRD_IEEE802154;
 433         /* Frame Control + Sequence Number + Address fields + Security Header */
 434         dev->hard_header_len    = 2 + 1 + 20 + 14;
 435         dev->needed_tailroom    = 2; /* FCS */
 436         dev->mtu                = 1281;
 437         dev->tx_queue_len       = 0;
 438         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 439         dev->watchdog_timeo     = 0;
 440
 441         dev->netdev_ops         = &lowpan_netdev_ops;
 442         dev->header_ops         = &lowpan_header_ops;
 443         dev->ml_priv            = &lowpan_mlme;
 444         dev->destructor         = free_netdev;
 445 }
 446
 447 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
 448 {
 449         if (tb[IFLA_ADDRESS]) {
 450                 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
 451                         return -EINVAL;
 452         }
 453         return 0;
 454 }
 455
 456 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
 457         struct packet_type *pt, struct net_device *orig_dev)
 458 {
 459         struct ieee802154_hdr hdr;
 460         int ret;
 461
 462         skb = skb_share_check(skb, GFP_ATOMIC);
 463         if (!skb)
 464                 goto drop;
 465
 466         if (!netif_running(dev))
 467                 goto drop_skb;
 468
 469         if (dev->type != ARPHRD_IEEE802154)
 470                 goto drop_skb;
 471
 472         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
 473                 goto drop_skb;
 474
 475         /* check that it's our buffer */
 476         if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
 477                 skb->protocol = htons(ETH_P_IPV6);
 478                 skb->pkt_type = PACKET_HOST;
 479
 480                 /* Pull off the 1-byte of 6lowpan header. */
 481                 skb_pull(skb, 1);
 482
 483                 ret = lowpan_give_skb_to_devices(skb, NULL);
 484                 if (ret == NET_RX_DROP)
 485                         goto drop;
 486         } else {
 487                 switch (skb->data[0] & 0xe0) {
 488                 case LOWPAN_DISPATCH_IPHC:      /* ipv6 datagram */
 489                         ret = process_data(skb, &hdr);
 490                         if (ret == NET_RX_DROP)
 491                                 goto drop;
 492                         break;
 493                 case LOWPAN_DISPATCH_FRAG1:     /* first fragment header */
 494                         ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1);
 495                         if (ret == 1) {
 496                                 ret = process_data(skb, &hdr);
 497                                 if (ret == NET_RX_DROP)
 498                                         goto drop;
 499                         }
 500                         break;
 501                 case LOWPAN_DISPATCH_FRAGN:     /* next fragments headers */
 502                         ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN);
 503                         if (ret == 1) {
 504                                 ret = process_data(skb, &hdr);
 505                                 if (ret == NET_RX_DROP)
 506                                         goto drop;
 507                         }
 508                         break;
 509                 default:
 510                         break;
 511                 }
 512         }
 513
 514         return NET_RX_SUCCESS;
 515 drop_skb:
 516         kfree_skb(skb);
 517 drop:
 518         return NET_RX_DROP;
 519 }
 520
 521 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
 522                           struct nlattr *tb[], struct nlattr *data[])
 523 {
 524         struct net_device *real_dev;
 525         struct lowpan_dev_record *entry;
 526
 527         pr_debug("adding new link\n");
 528
 529         if (!tb[IFLA_LINK])
 530                 return -EINVAL;
 531         /* find and hold real wpan device */
 532         real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 533         if (!real_dev)
 534                 return -ENODEV;
 535         if (real_dev->type != ARPHRD_IEEE802154) {
 536                 dev_put(real_dev);
 537                 return -EINVAL;
 538         }
 539
 540         lowpan_dev_info(dev)->real_dev = real_dev;
 541         mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
 542
 543         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 544         if (!entry) {
 545                 dev_put(real_dev);
 546                 lowpan_dev_info(dev)->real_dev = NULL;
 547                 return -ENOMEM;
 548         }
 549
 550         entry->ldev = dev;
 551
 552         /* Set the lowpan harware address to the wpan hardware address. */
 553         memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
 554
 555         mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
 556         INIT_LIST_HEAD(&entry->list);
 557         list_add_tail(&entry->list, &lowpan_devices);
 558         mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
 559
 560         register_netdevice(dev);
 561
 562         return 0;
 563 }
 564
 565 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
 566 {
 567         struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
 568         struct net_device *real_dev = lowpan_dev->real_dev;
 569         struct lowpan_dev_record *entry, *tmp;
 570
 571         ASSERT_RTNL();
 572
 573         mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
 574         list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
 575                 if (entry->ldev == dev) {
 576                         list_del(&entry->list);
 577                         kfree(entry);
 578                 }
 579         }
 580         mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
 581
 582         mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
 583
 584         unregister_netdevice_queue(dev, head);
 585
 586         dev_put(real_dev);
 587 }
 588
 589 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
 590         .kind           = "lowpan",
 591         .priv_size      = sizeof(struct lowpan_dev_info),
 592         .setup          = lowpan_setup,
 593         .newlink        = lowpan_newlink,
 594         .dellink        = lowpan_dellink,
 595         .validate       = lowpan_validate,
 596 };
 597
 598 static inline int __init lowpan_netlink_init(void)
 599 {
 600         return rtnl_link_register(&lowpan_link_ops);
 601 }
 602
 603 static inline void lowpan_netlink_fini(void)
 604 {
 605         rtnl_link_unregister(&lowpan_link_ops);
 606 }
 607
 608 static int lowpan_device_event(struct notifier_block *unused,
 609                                unsigned long event, void *ptr)
 610 {
 611         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 612         LIST_HEAD(del_list);
 613         struct lowpan_dev_record *entry, *tmp;
 614
 615         if (dev->type != ARPHRD_IEEE802154)
 616                 goto out;
 617
 618         if (event == NETDEV_UNREGISTER) {
 619                 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
 620                         if (lowpan_dev_info(entry->ldev)->real_dev == dev)
 621                                 lowpan_dellink(entry->ldev, &del_list);
 622                 }
 623
 624                 unregister_netdevice_many(&del_list);
 625         }
 626
 627 out:
 628         return NOTIFY_DONE;
 629 }
 630
 631 static struct notifier_block lowpan_dev_notifier = {
 632         .notifier_call = lowpan_device_event,
 633 };
 634
 635 static struct packet_type lowpan_packet_type = {
 636         .type = htons(ETH_P_IEEE802154),
 637         .func = lowpan_rcv,
 638 };
 639
 640 static int __init lowpan_init_module(void)
 641 {
 642         int err = 0;
 643
 644         err = lowpan_net_frag_init();
 645         if (err < 0)
 646                 goto out;
 647
 648         err = lowpan_netlink_init();
 649         if (err < 0)
 650                 goto out_frag;
 651
 652         dev_add_pack(&lowpan_packet_type);
 653
 654         err = register_netdevice_notifier(&lowpan_dev_notifier);
 655         if (err < 0)
 656                 goto out_pack;
 657
 658         return 0;
 659
 660 out_pack:
 661         dev_remove_pack(&lowpan_packet_type);
 662         lowpan_netlink_fini();
 663 out_frag:
 664         lowpan_net_frag_exit();
 665 out:
 666         return err;
 667 }
 668
 669 static void __exit lowpan_cleanup_module(void)
 670 {
 671         lowpan_netlink_fini();
 672
 673         dev_remove_pack(&lowpan_packet_type);
 674
 675         lowpan_net_frag_exit();
 676
 677         unregister_netdevice_notifier(&lowpan_dev_notifier);
 678 }
 679
 680 module_init(lowpan_init_module);
 681 module_exit(lowpan_cleanup_module);
 682 MODULE_LICENSE("GPL");
 683 MODULE_ALIAS_RTNL_LINK("lowpan");